From the company website:
Magenta Software is a UK Games Developer based in Liverpool.
Founded in 1994 by developers whose roots went back to the early days of home computer games, Magenta Software's in-house focus has always been towards developing great game play, which we believe is the true life-blood of any great title.
We are a first party developer for Sony on both the Playstation 2 and 3. In addition we are registered developers for Xbox 360 and Nintendo Wii.